Born scattering and inversion sensitivities in viscoelastic transversely isotropic media. Issue 2 (26th August 2017)

• Record Type: Journal Article
• Authors: Moradi, Shahpoor; Innanen, Kristopher A.
• Is Part Of: Geophysical journal international. Volume 211:Issue 2(2017:Nov.)
• Page Start: 1177
• Page End: 1188
• Publication Date: 2017-08-26
• Subjects: Waveform inversion; Seismic anisotropy -- Seismic attenuation -- Wave scattering and diffraction; Geophysics -- Periodicals; 550
• DOI: 10.1093/gji/ggx363
• Languages: English
• ISSNs: 0956-540X

Abstract

Summary: We analyse the scattering of seismic waves from anisotropic-viscoelastic inclusions using the Born approximation. We consider the specific case of Vertical Transverse Isotropic (VTI) media with low-loss attenuation and weak anisotropy such that second- and higher-order contributions from quality factors and Thomsen parameters are negligible. To accommodate the volume scattering approach, the viscoelastic VTI media is broken into a homogeneous viscoelastic reference medium with distributed inclusions in both viscoelastic and anisotropic properties. In viscoelastic reference media in which all propagations take place, wave modes are of P -wave type, SI -wave type and SII -wave type, all with complex slowness and polarization vectors. We generate expressions for P -to- P, P -to- SI, SI -to- SI and SII -to- SII scattering potentials, and demonstrate that they reduce to previously derived isotropic results. These scattering potential expressions are sensitivity kernels related to the Fréchet derivatives which provide the weights for multiparameter full waveform inversion updates.